Properties of the Number 21255

Twenty-One Thousand Two Hundred Fifty-Five

Basics

Value: 21254 → 21255 → 21256

Parity: odd

Prime: No

Previous Prime: 21247

Next Prime: 21269

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 3 × 5 × 13 × 109

Divisors: 1, 3, 5, 13, 15, 39, 65, 109, 195, 327

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001100000111

Octal: 51407

Duodecimal: 10373

Hexadecimal: 5307

Square: 451775025

Square Root: 145.79094622095022

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

a(n) = n*(14·n - 1). A195024

Numbers k at which point A336459(k) appears multiplicative, but A051027(k) does not. A336561

Numbers k such that A353802(k) / σ(σ(k)) is an integer > 1, where A353802(n) = ∏_p^e||n σ(σ(p^e)). A353807

Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 15 ones. A31783

Antidiagonal sums of the array A380841. A380843

Decimal expansion of 1/251. A21255